Det-Tronics X9800 IR Flame Detector - Manual (Page 5)

3 95-8554 11.1
CaUtIon
These tests require disabling of all extinguishing
devices to avoid release resulting from a
successful test.
The Mag oi test is performed by placing a magnet at the
location marked "MAG OI" on the outside of the detector
(see Figure 2). The Man oi test is accomplished by
connecting the oi lead (terminal 22) to power supply
minus via an external switch. The magnet or switch must
be held in place for a minimum of 6 seconds to complete
the test. Either of these test methods activates the
calibrated IR emitter. If the resulting signal meets the test
criteria, indicating that greater than half of the detection
range remains, the Alarm output changes state, the
indicating LED changes to red, and the 0-20 mA current
output goes to 20 mA. This condition remains until the
magnet is removed or the switch is released, regardless
of whether the relays are set for latching or non-latching
operation.
If less than half of the detection range remains, no
alarm is produced and a fault is generated. The fault
indication can be reset by momentarily applying the
Mag oi or Man oi switch.
NOTE
Refer to Appendix A for FM verification of
Det-Tronics’
oi function.
COMMuNICATION
The X9800 is furnished with an RS-485 interface for
communicating status and other information with external
devices. The RS-485 supports MODBUS protocol, with
the detector configured as a slave device.
For HART communication, connect a HART communicator
across a 250 ohm resistor in the 0-20 mA loop.
NOTE
The EQP model uses LON/SLC communication.
RS-485 and HART communication are not
available on the EQP model.
DATA LOggINg
Data logging capability is also provided. Status
conditions such as normal, power down, general and
oi faults, pre-alarm, fire alarm, time and temperature
are recorded. Each event is time and date stamped,
along with the temperature and input voltage. Event
data is stored in non-volatile memory when the event
becomes active, and again when the status changes.
Data is accessible using Det-Tronics' Inspector Connector
accessory, RS-485, or the EQP Controller.
INTEgRAL WIRINg COMpARTMENT
All external wiring to the device is connected within the
integral junction box. The detector is furnished with
four conduit entries, with either 3/4 inch NPT or M25
threads.
signal processing options
The X9800 features signal processing options. These
options determine the type of logic that the detector will
use for processing fire signals to customize the X9800
to the application. Two signal processing options are
available for the X9800:
– TDSA enabled
– Both TDSA and Quick Fire enabled (either initiates
fire alarm).
Time Domain signal Analysis (TDsA)
The TDSA signal processing technique analyzes the
input signal in real time, requiring the IR signal to flicker
randomly in order to recognize it as a fire condition.
Using TDSA signal processing, the X9800 ignores
regularly chopped blackbody sources (occurring in areas
where moving conveyors and hot objects in proximity
to one another result in a regularly chopped IR signal),
because it looks for a less uniform signal. However, in
the presence of a regularly chopped signal, the detector
is more susceptible to false alarms due to sporadic IR
that functions as a trigger when occurring in conjunction
with the regularly chopped signal.
Quick Fire (High speed)
The Quick Fire (High Speed) feature can be used in
conjunction with the TDSA signal processing method.
This method overrides TDSA requirements in the event
of a sudden and intense signal, such as the result of a
flash fire. When Quick Fire is activated, the detector is
capable of responding to an intense fire signal in less
than 30 milliseconds (0.030 seconds). Using the Quick
Fire feature in conjunction with TDSA signal processing
allows the detector to provide a high speed response to
a large, non-flickering fire (such as in high pressure gas
applications). Additionally, when the Quick Fire feature
and TDSA signal processing are used in conjuction, the
detector maintains an ability to respond to fires that start
very small and grow in size and intensity over time.